Category Archives: Kenwood TS850s

Kenwood TS850s

Kenwood TS 850s si largimea de banda

Mai mult din curiozitate dar si pentru a afla cu exactitate ce filtre detine dotarea standard a transceiverului  Kenwood TS 850s AT pe care-l detin m-am apucat de facut “sapaturi” folosind vasta sursa de informatie pe care ne-o ofera Internetul.

Din cautare in cautare am dat peste “Kenwood TS 850s Service Manual and Notes” versiunea PDF, thanks God ca mai sunt unii care digitalizeaza asemenea documente si le pun la dispozitie si altor interesati (a se vedea si proiectul Restitutio initiat de SRR).

Rasfoind manualul am dat exact peste informatia pe care o cautam. La pagina 12 se dau caracteristicile filtrelor ce se gasesc in dotarea standard a rig-ului (click pe imaginea de mai sus pentru versiunea intr-o rezolutie mai mare).

Voi spicui din acele tabele sectiunea ce m-a interesat, adica Pass Bandwidth, Nominal center frequency precum si tipul filtrului (XF- Cristal , CF – Filtru Ceramic).

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YO3HYR CAT Digital Interface for Kenwood TS850s AT

With some help from Marius YO3HYR, I finally manage to connect the Kenwood TS850s AT to the computer on the CAT interface and also as a digital mode. Above you can see some photos of the wonderful work of YO3HYR interface.

Interfete CAT / Moduri Digitale pentru transceiverele ICOM, Kenwood, Yaesu pot fi comandate prin intermediul HamShop sau direct la YO3HYR.

Kenwood TS850s complete electrolytic capacitor replace

electrolytic_capacitor_replace_kenwood_ts850s

Everybody knows the fact that Kenwood TS850s is a great transceiver but unfortunately at the-same time this rig is at least 13 years old.

One of the electronic component type that has problem with age are the electrolytic capacitors contained in the transceiver. By the passing of time, due to leakage, electrical stress or heat exposure the characteristic value of those components  can be changed.

To obtain the best result, and prolong the transceiver life I guess is a good idea to replace all the electrolytic capacitors inside my TS850s.

According to an eBay post, there are 113 small electrolytic capacitors used in the TS850s. The price (39USD) is a bit high so I’ll acquire them from a local electronic part store.

So, we need:

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Kenwood TS-850s Carrier set point adjustments

kenwood_ts850s_CARRIER_SET_ POINT_ADJUSTMENT DRU2_Bay

Today I’ve made some carrier set point adjustments on my Kenwood TS850s so that I’ll have the-same audio tone on LSB and USB according to my voice.

1. First of all, open the little hatch on the top of the radio (on the place where DRU-2 unit and filter dip switch are located.  Click on the image above for hi-res version).

2. Plug the original Kenwood microphone ( I use the MC43 hand mike). Locate  VR501 (LSB) , VR502 (USB), VR503 (Balance Audio Tone).

3. Set the frequency on 14.200 Khz.

4. Turn the radio OFF and after that turn it ON while pressing also the F.Lock button.

5. A menu will be displayed. While rotating the M.CH/VFO.CH knob make sure that menu 00 (zero zero) is displayed.

6. Use a pair of headphones with the transceiver and push the Moni  button while adjusting the Moni knob for the right volume without getting mike feedback, hi.

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Kenwood TS850s ALC Problem fixed!

DC_DC_board_ts_850s_alc

In the post before I’ve told you about the classic ALC problem that my TS850s also encounter. The solution was simple, R2 and R3 on the DC/DC board must be changed from 22K to 18K. The two resistors are SMD so it’s very hard to work on them that’s why my solution was to mount in parallel with those, ordinary non-SMD 100K resistors to reach the value around 18K as recommended.

Well now everything works just fine. I’ve got proper ALC reading on all band with 100W output without any problems.

Some materials about the Kenwood TS850s ALC Problem can be found here and here.

ts850dc-dc_board ts850dcdc_cablaj